Chloroacetyl chloride → HCID 20554401, compound

Participants

Reaction Steps

6.25 g (0.044 mol) of chloroacetyl chloride in 15 ml of absolute dioxan and 4.4 ml of dry pyridine in 15 ml of dioxan are added dropwise simultaneously (at 80° C. and in the course of 20 minutes) to a suspension of 4.6 g (0.020 mol) of 6-methyl-5,6-dihydropyrimido[4,5-b][1,5]benzodiazepin-5-one in 35 ml of absolute dioxan. The mixture is heated at the boil for a further 15 minutes and is then allowed to cool. The supernatant liquid is decanted off from the heavy dark phase, and the latter is washed with methylene chloride; the dioxan and methylene chloride phases are concentrated in vacuo. The oil which remains is dissolved in a little chloroform and filtered through neutral silica gel; the filtrate is evaporated and the residue is recrystallized from isopropanol, yield: 2.8 g, m.p. 176° to 178° C. (dec.).

Provenance & Evidence